﻿// ***********************************************************************
// Copyright (c) 2008 Charlie Poole
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
// 
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
// ***********************************************************************

using System;
using System.Collections;
using System.Collections.Generic;
using System.Text;
using NUnit.Framework.Interfaces;

namespace NUnit.Framework.Internal.Builders
{
    /// <summary>
    /// The ParameterDataProvider class implements IParameterDataProvider
    /// and hosts one or more individual providers.
    /// </summary>
    public class ParameterDataProvider : IParameterDataProvider
    {
        private List<IParameterDataProvider> _providers = new List<IParameterDataProvider>();

        /// <summary>
        /// Construct with a collection of individual providers
        /// </summary>
        public ParameterDataProvider(params IParameterDataProvider[] providers)
        {
            _providers.AddRange(providers);
        }

        /// <summary>
        /// Determine whether any data is available for a parameter.
        /// </summary>
        /// <param name="parameter">An IParameterInfo representing one
        /// argument to a parameterized test</param>
        /// <returns>True if any data is available, otherwise false.</returns>
        public bool HasDataFor(IParameterInfo parameter)
        {
            foreach (var provider in _providers)
                if (provider.HasDataFor(parameter))
                    return true;

            return false;
        }

        /// <summary>
        /// Return an IEnumerable providing data for use with the
        /// supplied parameter.
        /// </summary>
        /// <param name="parameter">An IParameterInfo representing one
        /// argument to a parameterized test</param>
        /// <returns>An IEnumerable providing the required data</returns>
        public IEnumerable GetDataFor(IParameterInfo parameter)
        {
            foreach (var provider in _providers)
                foreach (object data in provider.GetDataFor(parameter))
                    yield return data;
        }
    }
}
